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3245eea0 | 1 | /* Define control and data flow tables, and regsets. |
e68e3108 | 2 | Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
3245eea0 | 3 | |
1322177d | 4 | This file is part of GCC. |
3245eea0 | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 2, or (at your option) any later | |
9 | version. | |
3245eea0 | 10 | |
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
3245eea0 CH |
15 | |
16 | You should have received a copy of the GNU General Public License | |
1322177d LB |
17 | along with GCC; see the file COPYING. If not, write to the Free |
18 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
3245eea0 | 20 | |
88657302 | 21 | #ifndef GCC_BASIC_BLOCK_H |
7f8a2125 | 22 | #define GCC_BASIC_BLOCK_H |
3245eea0 | 23 | |
19d18142 | 24 | #include "bitmap.h" |
5f6c11d6 | 25 | #include "sbitmap.h" |
e881bb1b | 26 | #include "varray.h" |
4e872036 | 27 | #include "partition.h" |
19d18142 | 28 | |
2b1d9dc0 DN |
29 | #ifndef TREE_CODE |
30 | union tree_node; | |
31 | #define tree union tree_node * | |
32 | #endif | |
33 | ||
b1dbfa1d BS |
34 | /* Head of register set linked list. */ |
35 | typedef bitmap_head regset_head; | |
36 | /* A pointer to a regset_head. */ | |
37 | typedef bitmap regset; | |
38 | ||
39 | /* Initialize a new regset. */ | |
40 | #define INIT_REG_SET(HEAD) bitmap_initialize (HEAD) | |
19d18142 RK |
41 | |
42 | /* Clear a register set by freeing up the linked list. */ | |
43 | #define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD) | |
44 | ||
45 | /* Copy a register set to another register set. */ | |
46 | #define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM) | |
47 | ||
d3a923ee RH |
48 | /* Compare two register sets. */ |
49 | #define REG_SET_EQUAL_P(A, B) bitmap_equal_p (A, B) | |
50 | ||
19d18142 RK |
51 | /* `and' a register set with a second register set. */ |
52 | #define AND_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_AND) | |
53 | ||
54 | /* `and' the complement of a register set with a register set. */ | |
55 | #define AND_COMPL_REG_SET(TO, FROM) \ | |
56 | bitmap_operation (TO, TO, FROM, BITMAP_AND_COMPL) | |
57 | ||
58 | /* Inclusive or a register set with a second register set. */ | |
59 | #define IOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_IOR) | |
60 | ||
d3a923ee RH |
61 | /* Exclusive or a register set with a second register set. */ |
62 | #define XOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_XOR) | |
63 | ||
19d18142 RK |
64 | /* Or into TO the register set FROM1 `and'ed with the complement of FROM2. */ |
65 | #define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \ | |
66 | bitmap_ior_and_compl (TO, FROM1, FROM2) | |
916b1701 MM |
67 | |
68 | /* Clear a single register in a register set. */ | |
19d18142 | 69 | #define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG) |
916b1701 MM |
70 | |
71 | /* Set a single register in a register set. */ | |
19d18142 | 72 | #define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG) |
916b1701 MM |
73 | |
74 | /* Return true if a register is set in a register set. */ | |
19d18142 | 75 | #define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG) |
916b1701 MM |
76 | |
77 | /* Copy the hard registers in a register set to the hard register set. */ | |
efc9bd41 | 78 | extern void reg_set_to_hard_reg_set PARAMS ((HARD_REG_SET *, bitmap)); |
916b1701 MM |
79 | #define REG_SET_TO_HARD_REG_SET(TO, FROM) \ |
80 | do { \ | |
916b1701 | 81 | CLEAR_HARD_REG_SET (TO); \ |
efc9bd41 | 82 | reg_set_to_hard_reg_set (&TO, FROM); \ |
916b1701 MM |
83 | } while (0) |
84 | ||
85 | /* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the | |
86 | register number and executing CODE for all registers that are set. */ | |
87 | #define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, CODE) \ | |
19d18142 | 88 | EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, CODE) |
916b1701 MM |
89 | |
90 | /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting | |
91 | REGNUM to the register number and executing CODE for all registers that are | |
92 | set in the first regset and not set in the second. */ | |
93 | #define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \ | |
19d18142 | 94 | EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE) |
916b1701 | 95 | |
22fa5b8a MM |
96 | /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting |
97 | REGNUM to the register number and executing CODE for all registers that are | |
98 | set in both regsets. */ | |
99 | #define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \ | |
100 | EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE) | |
101 | ||
916b1701 | 102 | /* Allocate a register set with oballoc. */ |
19d18142 | 103 | #define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK) |
916b1701 | 104 | |
ee25a7a5 MM |
105 | /* Initialize a register set. Returns the new register set. */ |
106 | #define INITIALIZE_REG_SET(HEAD) bitmap_initialize (&HEAD) | |
19d18142 RK |
107 | |
108 | /* Do any cleanup needed on a regset when it is no longer used. */ | |
109 | #define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET) | |
110 | ||
111 | /* Do any one-time initializations needed for regsets. */ | |
112 | #define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE () | |
113 | ||
114 | /* Grow any tables needed when the number of registers is calculated | |
115 | or extended. For the linked list allocation, nothing needs to | |
116 | be done, other than zero the statistics on the first allocation. */ | |
7f8a2125 | 117 | #define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P) |
916b1701 | 118 | |
b2aec5c0 JH |
119 | /* Type we use to hold basic block counters. Should be at least 64bit. */ |
120 | typedef HOST_WIDEST_INT gcov_type; | |
121 | ||
e881bb1b RH |
122 | /* Control flow edge information. */ |
123 | typedef struct edge_def { | |
124 | /* Links through the predecessor and successor lists. */ | |
125 | struct edge_def *pred_next, *succ_next; | |
3245eea0 | 126 | |
e881bb1b RH |
127 | /* The two blocks at the ends of the edge. */ |
128 | struct basic_block_def *src, *dest; | |
129 | ||
130 | /* Instructions queued on the edge. */ | |
131 | rtx insns; | |
132 | ||
133 | /* Auxiliary info specific to a pass. */ | |
134 | void *aux; | |
3245eea0 | 135 | |
e881bb1b RH |
136 | int flags; /* see EDGE_* below */ |
137 | int probability; /* biased by REG_BR_PROB_BASE */ | |
b2aec5c0 | 138 | gcov_type count; /* Expected number of executions calculated |
51891abe | 139 | in profile.c */ |
e881bb1b | 140 | } *edge; |
3245eea0 | 141 | |
e881bb1b | 142 | #define EDGE_FALLTHRU 1 |
4262e623 JH |
143 | #define EDGE_ABNORMAL 2 |
144 | #define EDGE_ABNORMAL_CALL 4 | |
145 | #define EDGE_EH 8 | |
146 | #define EDGE_FAKE 16 | |
147 | #define EDGE_DFS_BACK 32 | |
3245eea0 | 148 | |
65b98a02 JW |
149 | #define EDGE_COMPLEX (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH) |
150 | ||
3245eea0 | 151 | |
e68e3108 MM |
152 | /* A basic block is a sequence of instructions with only entry and |
153 | only one exit. If any one of the instructions are executed, they | |
154 | will all be executed, and in sequence from first to last. | |
155 | ||
156 | There may be COND_EXEC instructions in the basic block. The | |
157 | COND_EXEC *instructions* will be executed -- but if the condition | |
158 | is false the conditionally executed *expressions* will of course | |
159 | not be executed. We don't consider the conditionally executed | |
160 | expression (which might have side-effects) to be in a separate | |
161 | basic block because the program counter will always be at the same | |
162 | location after the COND_EXEC instruction, regardless of whether the | |
163 | condition is true or not. | |
164 | ||
165 | Basic blocks need not start with a label nor end with a jump insn. | |
b53978a3 JO |
166 | For example, a previous basic block may just "conditionally fall" |
167 | into the succeeding basic block, and the last basic block need not | |
168 | end with a jump insn. Block 0 is a descendant of the entry block. | |
169 | ||
170 | A basic block beginning with two labels cannot have notes between | |
171 | the labels. | |
172 | ||
173 | Data for jump tables are stored in jump_insns that occur in no | |
174 | basic block even though these insns can follow or precede insns in | |
175 | basic blocks. */ | |
176 | ||
e881bb1b RH |
177 | /* Basic block information indexed by block number. */ |
178 | typedef struct basic_block_def { | |
179 | /* The first and last insns of the block. */ | |
180 | rtx head, end; | |
3245eea0 | 181 | |
2b1d9dc0 DN |
182 | /* The first and last trees of the block. */ |
183 | tree head_tree; | |
184 | tree end_tree; | |
185 | ||
e881bb1b RH |
186 | /* The edges into and out of the block. */ |
187 | edge pred, succ; | |
4d1d8045 | 188 | |
e68e3108 MM |
189 | /* Liveness info. */ |
190 | ||
191 | /* The registers that are modified within this in block. */ | |
e881bb1b | 192 | regset local_set; |
e68e3108 MM |
193 | /* The registers that are conditionally modified within this block. |
194 | In other words, registers that are set only as part of a | |
195 | COND_EXEC. */ | |
7dfc0fbe | 196 | regset cond_local_set; |
e68e3108 MM |
197 | /* The registers that are live on entry to this block. |
198 | ||
199 | Note that in SSA form, global_live_at_start does not reflect the | |
200 | use of regs in phi functions, since the liveness of these regs | |
201 | may depend on which edge was taken into the block. */ | |
e881bb1b | 202 | regset global_live_at_start; |
e68e3108 | 203 | /* The registers that are live on exit from this block. */ |
e881bb1b | 204 | regset global_live_at_end; |
4d1d8045 | 205 | |
e881bb1b RH |
206 | /* Auxiliary info specific to a pass. */ |
207 | void *aux; | |
3245eea0 | 208 | |
e881bb1b RH |
209 | /* The index of this block. */ |
210 | int index; | |
336a6399 | 211 | |
52a11cbf RH |
212 | /* The loop depth of this block. */ |
213 | int loop_depth; | |
51891abe | 214 | |
52a11cbf | 215 | /* Expected number of executions: calculated in profile.c. */ |
b2aec5c0 | 216 | gcov_type count; |
7f8a2125 | 217 | |
861f9cd0 JH |
218 | /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */ |
219 | int frequency; | |
006844a3 DN |
220 | |
221 | /* Various flags. See BB_* below. */ | |
222 | int flags; | |
e881bb1b | 223 | } *basic_block; |
7f8a2125 | 224 | |
861f9cd0 | 225 | #define BB_FREQ_MAX 10000 |
e881bb1b | 226 | |
006844a3 DN |
227 | /* Masks for basic_block.flags. */ |
228 | #define BB_REACHABLE 1 | |
229 | ||
e881bb1b RH |
230 | /* Number of basic blocks in the current function. */ |
231 | ||
232 | extern int n_basic_blocks; | |
233 | ||
d3a923ee RH |
234 | /* Number of edges in the current function. */ |
235 | ||
236 | extern int n_edges; | |
237 | ||
e881bb1b RH |
238 | /* Index by basic block number, get basic block struct info. */ |
239 | ||
240 | extern varray_type basic_block_info; | |
241 | ||
242 | #define BASIC_BLOCK(N) (VARRAY_BB (basic_block_info, (N))) | |
3245eea0 | 243 | |
19d18142 RK |
244 | /* What registers are live at the setjmp call. */ |
245 | ||
246 | extern regset regs_live_at_setjmp; | |
247 | ||
402209ff JH |
248 | /* Special labels found during CFG build. */ |
249 | ||
250 | extern rtx label_value_list, tail_recursion_label_list; | |
251 | ||
252 | extern struct obstack flow_obstack; | |
253 | ||
3245eea0 CH |
254 | /* Indexed by n, gives number of basic block that (REG n) is used in. |
255 | If the value is REG_BLOCK_GLOBAL (-2), | |
256 | it means (REG n) is used in more than one basic block. | |
257 | REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know. | |
258 | This information remains valid for the rest of the compilation | |
259 | of the current function; it is used to control register allocation. */ | |
260 | ||
261 | #define REG_BLOCK_UNKNOWN -1 | |
262 | #define REG_BLOCK_GLOBAL -2 | |
b1f21e0a | 263 | |
6feacd09 | 264 | #define REG_BASIC_BLOCK(N) (VARRAY_REG (reg_n_info, N)->basic_block) |
5ece9746 JL |
265 | \f |
266 | /* Stuff for recording basic block info. */ | |
267 | ||
e881bb1b RH |
268 | #define BLOCK_HEAD(B) (BASIC_BLOCK (B)->head) |
269 | #define BLOCK_END(B) (BASIC_BLOCK (B)->end) | |
5ece9746 | 270 | |
2b1d9dc0 DN |
271 | #define BLOCK_HEAD_TREE(B) (BASIC_BLOCK (B)->head_tree) |
272 | #define BLOCK_END_TREE(B) (BASIC_BLOCK (B)->end_tree) | |
273 | ||
5ece9746 JL |
274 | /* Special block numbers [markers] for entry and exit. */ |
275 | #define ENTRY_BLOCK (-1) | |
276 | #define EXIT_BLOCK (-2) | |
277 | ||
b53978a3 JO |
278 | /* Special block number not valid for any block. */ |
279 | #define INVALID_BLOCK (-3) | |
280 | ||
e881bb1b RH |
281 | /* Similarly, block pointers for the edge list. */ |
282 | extern struct basic_block_def entry_exit_blocks[2]; | |
283 | #define ENTRY_BLOCK_PTR (&entry_exit_blocks[0]) | |
284 | #define EXIT_BLOCK_PTR (&entry_exit_blocks[1]) | |
285 | ||
e881bb1b RH |
286 | extern varray_type basic_block_for_insn; |
287 | #define BLOCK_FOR_INSN(INSN) VARRAY_BB (basic_block_for_insn, INSN_UID (INSN)) | |
288 | #define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0) | |
289 | ||
3d994c6b | 290 | extern void compute_bb_for_insn PARAMS ((int)); |
3c030e88 | 291 | extern void free_bb_for_insn PARAMS ((void)); |
c586192c | 292 | extern void update_bb_for_insn PARAMS ((basic_block)); |
3d994c6b | 293 | extern void set_block_for_insn PARAMS ((rtx, basic_block)); |
ccbaf064 | 294 | extern void set_block_for_new_insns PARAMS ((rtx, basic_block)); |
e881bb1b | 295 | |
3d994c6b | 296 | extern void free_basic_block_vars PARAMS ((int)); |
52becdc0 | 297 | |
c586192c | 298 | extern edge split_block PARAMS ((basic_block, rtx)); |
3d994c6b KG |
299 | extern basic_block split_edge PARAMS ((edge)); |
300 | extern void insert_insn_on_edge PARAMS ((rtx, edge)); | |
301 | extern void commit_edge_insertions PARAMS ((void)); | |
302 | extern void remove_fake_edges PARAMS ((void)); | |
303 | extern void add_noreturn_fake_exit_edges PARAMS ((void)); | |
b53978a3 | 304 | extern void connect_infinite_loops_to_exit PARAMS ((void)); |
7f8a2125 | 305 | extern int flow_call_edges_add PARAMS ((sbitmap)); |
7ded4467 JH |
306 | extern edge cached_make_edge PARAMS ((sbitmap *, basic_block, |
307 | basic_block, int)); | |
308 | extern edge make_edge PARAMS ((basic_block, | |
309 | basic_block, int)); | |
310 | extern edge make_single_succ_edge PARAMS ((basic_block, | |
69732dcb RH |
311 | basic_block, int)); |
312 | extern void remove_edge PARAMS ((edge)); | |
f008a564 | 313 | extern void redirect_edge_succ PARAMS ((edge, basic_block)); |
c23bb84b | 314 | extern edge redirect_edge_succ_nodup PARAMS ((edge, basic_block)); |
f008a564 | 315 | extern void redirect_edge_pred PARAMS ((edge, basic_block)); |
4262e623 JH |
316 | extern basic_block create_basic_block_structure PARAMS ((int, rtx, rtx, rtx)); |
317 | extern basic_block create_basic_block PARAMS ((int, rtx, rtx)); | |
52294521 | 318 | extern int flow_delete_block PARAMS ((basic_block)); |
dc108b7a RH |
319 | extern void merge_blocks_nomove PARAMS ((basic_block, basic_block)); |
320 | extern void tidy_fallthru_edge PARAMS ((edge, basic_block, | |
321 | basic_block)); | |
402209ff | 322 | extern void tidy_fallthru_edges PARAMS ((void)); |
d59c5346 | 323 | extern void flow_reverse_top_sort_order_compute PARAMS ((int *)); |
10c4b247 | 324 | extern int flow_depth_first_order_compute PARAMS ((int *, int *)); |
316dcdf6 DN |
325 | extern void dump_edge_info PARAMS ((FILE *, edge, int)); |
326 | extern void clear_edges PARAMS ((void)); | |
327 | extern void mark_critical_edges PARAMS ((void)); | |
b62c8881 | 328 | extern rtx first_insn_after_basic_block_note PARAMS ((basic_block)); |
10c4b247 | 329 | |
4dc9341c MH |
330 | /* Structure to hold information for each natural loop. */ |
331 | struct loop | |
332 | { | |
c34d5374 | 333 | /* Index into loops array. */ |
4dc9341c MH |
334 | int num; |
335 | ||
336 | /* Basic block of loop header. */ | |
337 | basic_block header; | |
338 | ||
339 | /* Basic block of loop latch. */ | |
340 | basic_block latch; | |
341 | ||
342 | /* Basic block of loop pre-header or NULL if it does not exist. */ | |
343 | basic_block pre_header; | |
344 | ||
7f8a2125 | 345 | /* Array of edges along the pre-header extended basic block trace. |
4a7da9b5 MH |
346 | The source of the first edge is the root node of pre-header |
347 | extended basic block, if it exists. */ | |
348 | edge *pre_header_edges; | |
5d6a16e2 | 349 | |
4a7da9b5 MH |
350 | /* Number of edges along the pre_header extended basic block trace. */ |
351 | int num_pre_header_edges; | |
5d6a16e2 | 352 | |
65169dcf JE |
353 | /* The first block in the loop. This is not necessarily the same as |
354 | the loop header. */ | |
355 | basic_block first; | |
356 | ||
357 | /* The last block in the loop. This is not necessarily the same as | |
358 | the loop latch. */ | |
359 | basic_block last; | |
360 | ||
4dc9341c MH |
361 | /* Bitmap of blocks contained within the loop. */ |
362 | sbitmap nodes; | |
363 | ||
364 | /* Number of blocks contained within the loop. */ | |
365 | int num_nodes; | |
366 | ||
135ebc36 MH |
367 | /* Array of edges that enter the loop. */ |
368 | edge *entry_edges; | |
369 | ||
370 | /* Number of edges that enter the loop. */ | |
371 | int num_entries; | |
372 | ||
4dc9341c | 373 | /* Array of edges that exit the loop. */ |
135ebc36 | 374 | edge *exit_edges; |
4dc9341c MH |
375 | |
376 | /* Number of edges that exit the loop. */ | |
377 | int num_exits; | |
378 | ||
5d6a16e2 MH |
379 | /* Bitmap of blocks that dominate all exits of the loop. */ |
380 | sbitmap exits_doms; | |
381 | ||
4dc9341c MH |
382 | /* The loop nesting depth. */ |
383 | int depth; | |
384 | ||
385 | /* The height of the loop (enclosed loop levels) within the loop | |
386 | hierarchy tree. */ | |
387 | int level; | |
388 | ||
389 | /* The outer (parent) loop or NULL if outermost loop. */ | |
390 | struct loop *outer; | |
391 | ||
392 | /* The first inner (child) loop or NULL if innermost loop. */ | |
393 | struct loop *inner; | |
394 | ||
395 | /* Link to the next (sibling) loop. */ | |
396 | struct loop *next; | |
397 | ||
398 | /* Non-zero if the loop shares a header with another loop. */ | |
399 | int shared; | |
400 | ||
401 | /* Non-zero if the loop is invalid (e.g., contains setjmp.). */ | |
402 | int invalid; | |
403 | ||
404 | /* Auxiliary info specific to a pass. */ | |
52b38064 | 405 | void *aux; |
a2be868f MH |
406 | |
407 | /* The following are currently used by loop.c but they are likely to | |
408 | disappear as loop.c is converted to use the CFG. */ | |
409 | ||
410 | /* Non-zero if the loop has a NOTE_INSN_LOOP_VTOP. */ | |
411 | rtx vtop; | |
412 | ||
413 | /* Non-zero if the loop has a NOTE_INSN_LOOP_CONT. | |
414 | A continue statement will generate a branch to NEXT_INSN (cont). */ | |
415 | rtx cont; | |
416 | ||
417 | /* The dominator of cont. */ | |
418 | rtx cont_dominator; | |
419 | ||
420 | /* The NOTE_INSN_LOOP_BEG. */ | |
421 | rtx start; | |
422 | ||
423 | /* The NOTE_INSN_LOOP_END. */ | |
424 | rtx end; | |
425 | ||
426 | /* For a rotated loop that is entered near the bottom, | |
427 | this is the label at the top. Otherwise it is zero. */ | |
428 | rtx top; | |
429 | ||
430 | /* Place in the loop where control enters. */ | |
431 | rtx scan_start; | |
432 | ||
96a45535 MH |
433 | /* The position where to sink insns out of the loop. */ |
434 | rtx sink; | |
435 | ||
a2be868f MH |
436 | /* List of all LABEL_REFs which refer to code labels outside the |
437 | loop. Used by routines that need to know all loop exits, such as | |
438 | final_biv_value and final_giv_value. | |
7f8a2125 | 439 | |
a2be868f MH |
440 | This does not include loop exits due to return instructions. |
441 | This is because all bivs and givs are pseudos, and hence must be | |
442 | dead after a return, so the presense of a return does not affect | |
443 | any of the optimizations that use this info. It is simpler to | |
444 | just not include return instructions on this list. */ | |
445 | rtx exit_labels; | |
446 | ||
447 | /* The number of LABEL_REFs on exit_labels for this loop and all | |
448 | loops nested inside it. */ | |
449 | int exit_count; | |
4dc9341c MH |
450 | }; |
451 | ||
452 | ||
453 | /* Structure to hold CFG information about natural loops within a function. */ | |
454 | struct loops | |
455 | { | |
456 | /* Number of natural loops in the function. */ | |
457 | int num; | |
458 | ||
d6181b1b MH |
459 | /* Maxium nested loop level in the function. */ |
460 | int levels; | |
461 | ||
4dc9341c MH |
462 | /* Array of natural loop descriptors (scanning this array in reverse order |
463 | will find the inner loops before their enclosing outer loops). */ | |
464 | struct loop *array; | |
465 | ||
466 | /* Pointer to root of loop heirachy tree. */ | |
2b1d9dc0 | 467 | struct loop *tree_root; |
4dc9341c MH |
468 | |
469 | /* Information derived from the CFG. */ | |
470 | struct cfg | |
471 | { | |
472 | /* The bitmap vector of dominators or NULL if not computed. */ | |
473 | sbitmap *dom; | |
474 | ||
475 | /* The ordering of the basic blocks in a depth first search. */ | |
476 | int *dfs_order; | |
c34d5374 MH |
477 | |
478 | /* The reverse completion ordering of the basic blocks found in a | |
479 | depth first search. */ | |
480 | int *rc_order; | |
4dc9341c MH |
481 | } cfg; |
482 | ||
483 | /* Headers shared by multiple loops that should be merged. */ | |
484 | sbitmap shared_headers; | |
485 | }; | |
486 | ||
5d6a16e2 MH |
487 | extern int flow_loops_find PARAMS ((struct loops *, int flags)); |
488 | extern int flow_loops_update PARAMS ((struct loops *, int flags)); | |
3d994c6b | 489 | extern void flow_loops_free PARAMS ((struct loops *)); |
6057c0e6 MH |
490 | extern void flow_loops_dump PARAMS ((const struct loops *, FILE *, |
491 | void (*)(const struct loop *, | |
492 | FILE *, int), int)); | |
493 | extern void flow_loop_dump PARAMS ((const struct loop *, FILE *, | |
494 | void (*)(const struct loop *, | |
495 | FILE *, int), int)); | |
eab02feb | 496 | extern int flow_loop_scan PARAMS ((struct loops *, struct loop *, int)); |
4dc9341c | 497 | |
410538ea | 498 | /* This structure maintains an edge list vector. */ |
7f8a2125 | 499 | struct edge_list |
410538ea AM |
500 | { |
501 | int num_blocks; | |
502 | int num_edges; | |
503 | edge *index_to_edge; | |
504 | }; | |
505 | ||
506 | /* This is the value which indicates no edge is present. */ | |
507 | #define EDGE_INDEX_NO_EDGE -1 | |
508 | ||
509 | /* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE | |
510 | if there is no edge between the 2 basic blocks. */ | |
511 | #define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ))) | |
512 | ||
513 | /* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic | |
514 | block which is either the pred or succ end of the indexed edge. */ | |
515 | #define INDEX_EDGE_PRED_BB(el, index) ((el)->index_to_edge[(index)]->src) | |
516 | #define INDEX_EDGE_SUCC_BB(el, index) ((el)->index_to_edge[(index)]->dest) | |
517 | ||
518 | /* INDEX_EDGE returns a pointer to the edge. */ | |
519 | #define INDEX_EDGE(el, index) ((el)->index_to_edge[(index)]) | |
520 | ||
521 | /* Number of edges in the compressed edge list. */ | |
522 | #define NUM_EDGES(el) ((el)->num_edges) | |
523 | ||
7a442791 JH |
524 | /* BB is assumed to contain conditional jump. Return the fallthru edge. */ |
525 | #define FALLTHRU_EDGE(bb) ((bb)->succ->flags & EDGE_FALLTHRU \ | |
526 | ? (bb)->succ : (bb)->succ->succ_next) | |
527 | ||
528 | /* BB is assumed to contain conditional jump. Return the branch edge. */ | |
529 | #define BRANCH_EDGE(bb) ((bb)->succ->flags & EDGE_FALLTHRU \ | |
530 | ? (bb)->succ->succ_next : (bb)->succ) | |
531 | ||
134d3a2e JH |
532 | /* Return expected execution frequency of the edge E. */ |
533 | #define EDGE_FREQUENCY(e) (((e)->src->frequency \ | |
534 | * (e)->probability \ | |
535 | + REG_BR_PROB_BASE / 2) \ | |
536 | / REG_BR_PROB_BASE) | |
537 | ||
4262e623 JH |
538 | /* Return nonzero if edge is critical. */ |
539 | #define EDGE_CRITICAL_P(e) ((e)->src->succ->succ_next \ | |
540 | && (e)->dest->pred->pred_next) | |
541 | ||
3d994c6b KG |
542 | struct edge_list * create_edge_list PARAMS ((void)); |
543 | void free_edge_list PARAMS ((struct edge_list *)); | |
544 | void print_edge_list PARAMS ((FILE *, struct edge_list *)); | |
545 | void verify_edge_list PARAMS ((FILE *, struct edge_list *)); | |
7f8a2125 | 546 | int find_edge_index PARAMS ((struct edge_list *, |
3d994c6b | 547 | basic_block, basic_block)); |
410538ea | 548 | |
49c3bb12 | 549 | |
d3a923ee RH |
550 | enum update_life_extent |
551 | { | |
715e7fbc RH |
552 | UPDATE_LIFE_LOCAL = 0, |
553 | UPDATE_LIFE_GLOBAL = 1, | |
5a425893 | 554 | UPDATE_LIFE_GLOBAL_RM_NOTES = 2 |
d3a923ee RH |
555 | }; |
556 | ||
49c3bb12 RH |
557 | /* Flags for life_analysis and update_life_info. */ |
558 | ||
559 | #define PROP_DEATH_NOTES 1 /* Create DEAD and UNUSED notes. */ | |
560 | #define PROP_LOG_LINKS 2 /* Create LOG_LINKS. */ | |
561 | #define PROP_REG_INFO 4 /* Update regs_ever_live et al. */ | |
562 | #define PROP_KILL_DEAD_CODE 8 /* Remove dead code. */ | |
563 | #define PROP_SCAN_DEAD_CODE 16 /* Scan for dead code. */ | |
11f68165 JW |
564 | #define PROP_ALLOW_CFG_CHANGES 32 /* Allow the CFG to be changed |
565 | by dead code removal. */ | |
566 | #define PROP_AUTOINC 64 /* Create autoinc mem references. */ | |
567 | #define PROP_FINAL 127 /* All of the above. */ | |
5d6a16e2 | 568 | |
46fac664 JH |
569 | #define CLEANUP_EXPENSIVE 1 /* Do relativly expensive optimizations |
570 | except for edge forwarding */ | |
571 | #define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */ | |
572 | #define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need | |
573 | to care REG_DEAD notes. */ | |
4793dca1 JH |
574 | #define CLEANUP_PRE_SIBCALL 8 /* Do not get confused by code hidden |
575 | inside call_placeholders.. */ | |
0068fd96 JH |
576 | #define CLEANUP_PRE_LOOP 16 /* Take care to preserve syntactic loop |
577 | notes. */ | |
5d6a16e2 MH |
578 | /* Flags for loop discovery. */ |
579 | ||
7f8a2125 | 580 | #define LOOP_TREE 1 /* Build loop hierarchy tree. */ |
5d6a16e2 | 581 | #define LOOP_PRE_HEADER 2 /* Analyse loop pre-header. */ |
7f8a2125 AJ |
582 | #define LOOP_ENTRY_EDGES 4 /* Find entry edges. */ |
583 | #define LOOP_EXIT_EDGES 8 /* Find exit edges. */ | |
eab02feb | 584 | #define LOOP_EDGES (LOOP_ENTRY_EDGES | LOOP_EXIT_EDGES) |
7f8a2125 AJ |
585 | #define LOOP_EXITS_DOMS 16 /* Find nodes that dom. all exits. */ |
586 | #define LOOP_ALL 31 /* All of the above */ | |
5d6a16e2 | 587 | |
7f8a79ba | 588 | extern void life_analysis PARAMS ((rtx, FILE *, int)); |
3d994c6b KG |
589 | extern void update_life_info PARAMS ((sbitmap, enum update_life_extent, |
590 | int)); | |
591 | extern int count_or_remove_death_notes PARAMS ((sbitmap, int)); | |
11f68165 | 592 | extern int propagate_block PARAMS ((basic_block, regset, regset, regset, |
7dfc0fbe | 593 | int)); |
292f3869 RH |
594 | |
595 | struct propagate_block_info; | |
596 | extern rtx propagate_one_insn PARAMS ((struct propagate_block_info *, rtx)); | |
597 | extern struct propagate_block_info *init_propagate_block_info | |
7dfc0fbe | 598 | PARAMS ((basic_block, regset, regset, regset, int)); |
292f3869 | 599 | extern void free_propagate_block_info PARAMS ((struct propagate_block_info *)); |
d3a923ee | 600 | |
077692c6 | 601 | /* In lcm.c */ |
7f8a2125 AJ |
602 | extern struct edge_list *pre_edge_lcm PARAMS ((FILE *, int, sbitmap *, |
603 | sbitmap *, sbitmap *, | |
3d994c6b KG |
604 | sbitmap *, sbitmap **, |
605 | sbitmap **)); | |
606 | extern struct edge_list *pre_edge_rev_lcm PARAMS ((FILE *, int, sbitmap *, | |
7f8a2125 AJ |
607 | sbitmap *, sbitmap *, |
608 | sbitmap *, sbitmap **, | |
3d994c6b KG |
609 | sbitmap **)); |
610 | extern void compute_available PARAMS ((sbitmap *, sbitmap *, | |
611 | sbitmap *, sbitmap *)); | |
97d36f45 | 612 | extern int optimize_mode_switching PARAMS ((FILE *)); |
a05924f9 JH |
613 | |
614 | /* In emit-rtl.c. */ | |
3d994c6b KG |
615 | extern rtx emit_block_insn_after PARAMS ((rtx, rtx, basic_block)); |
616 | extern rtx emit_block_insn_before PARAMS ((rtx, rtx, basic_block)); | |
4dc9341c | 617 | |
f1ebdfc5 JE |
618 | /* In predict.c */ |
619 | extern void estimate_probability PARAMS ((struct loops *)); | |
994a57cd | 620 | extern void expected_value_to_br_prob PARAMS ((void)); |
f1ebdfc5 | 621 | |
11bdd2ae | 622 | /* In flow.c */ |
1f8f4a0b | 623 | extern void init_flow PARAMS ((void)); |
11bdd2ae | 624 | extern void reorder_basic_blocks PARAMS ((void)); |
b7ba4d8d ZW |
625 | extern void dump_bb PARAMS ((basic_block, FILE *)); |
626 | extern void debug_bb PARAMS ((basic_block)); | |
627 | extern void debug_bb_n PARAMS ((int)); | |
628 | extern void dump_regset PARAMS ((regset, FILE *)); | |
629 | extern void debug_regset PARAMS ((regset)); | |
1f8f4a0b | 630 | extern void allocate_reg_life_data PARAMS ((void)); |
c319629b | 631 | extern void allocate_bb_life_data PARAMS ((void)); |
d5c768b8 | 632 | extern void expunge_block PARAMS ((basic_block)); |
1e29ee12 | 633 | extern void find_unreachable_blocks PARAMS ((void)); |
0005550b | 634 | extern void delete_noop_moves PARAMS ((rtx)); |
6b24c259 | 635 | extern basic_block redirect_edge_and_branch_force PARAMS ((edge, basic_block)); |
4262e623 | 636 | extern basic_block force_nonfallthru PARAMS ((edge)); |
6b24c259 JH |
637 | extern bool redirect_edge_and_branch PARAMS ((edge, basic_block)); |
638 | extern rtx block_label PARAMS ((basic_block)); | |
639 | extern bool forwarder_block_p PARAMS ((basic_block)); | |
39f95a2c JH |
640 | extern bool purge_all_dead_edges PARAMS ((void)); |
641 | extern bool purge_dead_edges PARAMS ((basic_block)); | |
0005550b | 642 | extern void find_sub_basic_blocks PARAMS ((basic_block)); |
402209ff JH |
643 | extern bool can_fallthru PARAMS ((basic_block, basic_block)); |
644 | extern void flow_nodes_print PARAMS ((const char *, const sbitmap, | |
645 | FILE *)); | |
646 | extern void flow_edge_list_print PARAMS ((const char *, const edge *, | |
647 | int, FILE *)); | |
11bdd2ae | 648 | |
5b99e449 JL |
649 | /* This function is always defined so it can be called from the |
650 | debugger, and it is declared extern so we don't get warnings about | |
651 | it being unused. */ | |
652 | extern void verify_flow_info PARAMS ((void)); | |
653 | extern int flow_loop_outside_edge_p PARAMS ((const struct loop *, edge)); | |
654 | ||
4e872036 AS |
655 | typedef struct conflict_graph_def *conflict_graph; |
656 | ||
657 | /* Callback function when enumerating conflicts. The arguments are | |
658 | the smaller and larger regno in the conflict. Returns zero if | |
659 | enumeration is to continue, non-zero to halt enumeration. */ | |
b0340202 | 660 | typedef int (*conflict_graph_enum_fn) PARAMS ((int, int, void *)); |
4e872036 AS |
661 | |
662 | ||
663 | /* Prototypes of operations on conflict graphs. */ | |
664 | ||
7f8a2125 | 665 | extern conflict_graph conflict_graph_new |
4e872036 AS |
666 | PARAMS ((int)); |
667 | extern void conflict_graph_delete PARAMS ((conflict_graph)); | |
7f8a2125 | 668 | extern int conflict_graph_add PARAMS ((conflict_graph, |
4e872036 | 669 | int, int)); |
7f8a2125 | 670 | extern int conflict_graph_conflict_p PARAMS ((conflict_graph, |
4e872036 | 671 | int, int)); |
7f8a2125 AJ |
672 | extern void conflict_graph_enum PARAMS ((conflict_graph, int, |
673 | conflict_graph_enum_fn, | |
4e872036 AS |
674 | void *)); |
675 | extern void conflict_graph_merge_regs PARAMS ((conflict_graph, int, | |
676 | int)); | |
677 | extern void conflict_graph_print PARAMS ((conflict_graph, FILE*)); | |
7f8a2125 | 678 | extern conflict_graph conflict_graph_compute |
4e872036 AS |
679 | PARAMS ((regset, |
680 | partition)); | |
0ecf09f9 | 681 | extern bool mark_dfs_back_edges PARAMS ((void)); |
11bdd2ae | 682 | |
f8032688 MM |
683 | /* In dominance.c */ |
684 | ||
685 | enum cdi_direction | |
686 | { | |
687 | CDI_DOMINATORS, | |
688 | CDI_POST_DOMINATORS | |
689 | }; | |
690 | ||
691 | extern void calculate_dominance_info PARAMS ((int *, sbitmap *, | |
692 | enum cdi_direction)); | |
693 | ||
88657302 | 694 | #endif /* GCC_BASIC_BLOCK_H */ |